The sixth way is taken from the randomness to be found in things. Among things that exist we observe that some come to be by chance, as for example the striking of Earth-1 by a marsbody at precisely the right angle and speed to throw off a lunar divot. Or the end of a ball in a slot on the roulette wheel. Although the motion of the ball is governed by deterministic laws, the final cause - viz., which numbered slot it winds up in cannot be predicted.
However, we note that in paradigmatic random situations, such as a casino, great care and planning must be taken to ensure the requisite randomness. Equipment must be fabricated and installed, rules enacted, systems established for accounting for the results, attracting players, and so on. Thus while much of what happens in a casino happens by chance, the casino itself cannot happen by chance. It is thus clear that a random universe does not arise by chance, but by careful planning.
But careful planning requires a Planner. Etc.
(Sexta via sumitur ex fortuiti qui in rebus inveniuntur. Invenitur enim
in rebus aliquid in esse veniunt a casu, ut pro exemplo quod planeta magnitudinis Martis percuciet terram-I justum ius celeritate et angulus ut planeta magnitudinis Lunae abruptus est. Etc.)